The objective of this thesis is to present a morphosyntactic description of the Matis language (Panoan linguistic family), spoken by 262 persons that live in the medium Ituí - northwest of Amazonian area.

The work has seven chapters. In the chapter one, we present the Matis people situation and make considerations about some differences between Matis and Matses languages, that were classified as the same language for many time. In the chapter two to seven, we describe the phonological and morphosyntactic aspects of the Matis language. As any other researchers have not described this language, we described its morphology in a most expanded way, explaining, thereby, the function of each morpheme into each grammatical class. In addition, we comment general aspects of the syntax. Finally, the study of the Matis language is the result of a research that has as objectives to describe the phonological, morphological, and syntactic aspects of this language. The work contributes to the knowledge of this language, also to the whole Pano family languages, and to the researches of Brazilian indigenous languages.